Rotary pump

ABSTRACT

This invention relates to a pump for delivering a fluid between a casing and a rotor thereof to the discharge side of the casing by rotating the rotor, more particularly relates to a rotary pump operable as a species of eccentric pump, wherein the rotor or impeller having radially extended flexible vanes, is arranged eccentrically in the impeller chamber in such a manner that the outer edges of the vanes are in sliding engagement with the peripheral surface of the impeller chamber of the casing, whereby the flexible vanes are, upon rotation of the rotor, progressively curved to pump up the liquid from the intake side to the discharge side of the machine.

United States Patent (56] References Cited UNITED STATES PATENTS 2,599,600 6/1952 Arnold 418/154 2,664,050 12/1953 Abresch 418/154 2,935,242 5/1960 Lorenz 417/205 Primary ExaminerC. J. Husar Attorney-Blum, Moscovitz, Friedman & Kaplan ABSTRACT: This invention relates to a pump for delivering a fluid between a casing and a rotor thereof to the discharge side of the casing by rotating the rotor, more particularly relates to a rotary pump operable as a species of eccentric pump, wherein the rotor or impeller having radially extended flexible vanes, is arranged eccentrically in the impeller chamber in such a manner that the outer edges of the vanes are in sliding engagement with the peripheral surface of the impeller chamber of the casing, whereby the flexible vanes are, upon rotation of the rotor, progressively curved to pump up the liquid from the intake side to the discharge side of the machine.

PATENIEID Jun 1 m1 SHEET 2 OF 2 ROTARY PUMP BRIEF SUMMARY OF THE INVENTION This invention relates to a rotary pump, which performs a pumping operation of draining in and discharging out liquid by moving sealed spaces defined by the rotor vanes pressure engaged with the inner peripheral wall ofa casing.

Generally in a rotary pump of this type, a rotary impeller having resilient vanes made of for instance rubber is eccentrically arranged in theimpeller chamber in such a manner that the outer edges of the resilient vanes are in pressure engagement with the inner peripheral wall of the impeller chamber. As a result, upon rotation of the rotor, the vanes are gradually compressed against the inner peripheral surface of the impeller chamber and curved to pump the liquid confined between the adjacent vanes from the intake port to the discharge port. Accordingly, the inner peripheral wall of said impeller chamber is provided with an intake port and a discharge port, and resilient impeller is disposed eccentrically in the impeller chamber so as to change the volumes between the adjacent vanes of the impeller to the minimum in the vicinity of the discharge port and from the minimum to the maximum in the vicinity of the in take port. By utilizing the changing-over of the vanes of the impeller from the bent position to the unbent position, liquid is drawn in the spacing between the adjacent vanes from the intake port. The liquid is then squeezed out to the discharge port. The liquid is then squeezed out to the discharge port as the vanes bent are forced in curved attitude with the respective volumes between the adjacent vanes being reduced.

In such pump of this type, because the vanes of the impeller are made from rubber, synthetic resin or other elastic material and so arranged that their outer edges are curved in frictionally sliding engagement with the inner wall of the impeller chamber, there are many disadvantages, such as taking relatively considerable time for delivering liquid with larger frictional resistance and rather lower discharge pressure, thus adversely affecting the pumping efficiency due to wear of vanes and solid material contained in liquid. Further it has been uneconomical by wasteful power consumption since pumping action is affected by a sudden temperature change.

One of the objects of this invention is to eliminate these defects by use of the simple construction.

Another object of this invention is to remarkably simplify assembling and disassembling operations of the pump, to ensure fixed position of the rotor in the casing, to remarkably improve theefficiency of the pump without necessitating working accuracy, and thus to provide such pumps as to be unaffected by temperature changes at low price capable of economical mass production.

Another object of this invention is to provide simple and compact pumps which can be used with guaranteed reliabilities for pumping operations of liquid containing considerable amount of dust, such as oil changing within engines or draining muddy water without difficulty.

Still another object of this invention is to enable pumps to be used at an increased discharge pressure of liquid with a high-speed rotating operation and minimum pumping loss so as to deliver liquid efficiently, to reduce working hours and to simplify handling of pumps, in addition, to display their highest abilities.

In order to attain the respective objects mentioned above, a rotary pump constructed in accordance with this invention is characterized in that an impeller chamber communicating with an in take port and a discharge port is provided in a casing having intake and discharge ports, a rotary impeller having rubber-made resilient vanes is arranged eccentrically and rotatably in said impeller chamber in such a manner that the outer edges of said vanes are in frictionally engagement with the inner wall of said chamber, and an axial flow impeller for applying pressure to the fluid is disposed rotationally in a fluid passage between said impeller chamber and said discharge port, said axial flow impeller being driven through transmission mechanisms at a higher speed than that of said rotary impeller.

One of the essential features of this invention is to provide a rotary pump wherein a pump casing having an intake port and a discharge port arranged in parallel relation to each other is provided with an impeller chamber communicating with said intake and discharge port, the impeller having its radially extended resilient vanes arranged for eccentral and rotatable movement in said impeller chamber in such a manner that the outer edges of said impeller are in frictionally sliding engagement with the inner wall of said impeller chamber; a fluid passage is provided in parallel with said impeller chamber, said fluid passage being connected to said impeller chamber through a communicating passage so that the fluid delivered from said impeller chamber undergoes a directional change in reverse direction and flows towards the discharge port through said fluid passage; an axial flow impeller for applying pressure to the fluid is disposed rotatably in said fluid passage in parallel with said rotary impeller; and transmission mechanisms are provided to simultaneously drive said both impeller from a common drive power source.

In the rotary pump of this invention, an increase of pumping efficiency may be accomplished since the amount of discharge fluid to be delivered per hour and also the discharge pressure of fluid can be increased. Further, according to the present invention, since the lowering of pumping efficiency due to the wear of impeller is avoided, the present pump does not require extreme working accuracies so that its structure may be simplified with increased production.

Also, in the rotary pump of this invention, despite using a rotary impeller made of an elastic material, the pumping efficiency is remarkably improved by producing a drawing tendency of the rotary impeller by virtue of accelerating the return action of the vanes with the action of an axial flow impeller without necessitating use of a large-sized rotary impeller. The pump, in addition, has the merit of being compact and lightweight, capable of speed assembly and disassembled, and capable of being checked and operated with the highest reliability, as well as with simple adjustments, and easy handling the pumping'action being unaffected under temperature changes.

In accordance with this invention, such rotary pumps can be manufactured at low cost that draining-in and discharging actions are not adversely affected by a high-speed rotating operation with minimum pumping loss, and these pumps can be used for a long period of time under the stabilized condition by minimizing the lateral pressure produced with the rotor of the pump and by markedly reducing an extra resistance and power consumption.

Further, in accordance with this invention, pumps can be markedly improved so that they can be easily utilized for delivering liquid containing considerable amount of dust, such as sludge, metal powder, etc. without reducing the draining-in efficiency and with established reliabilities and working properties.

Still further, the rotary pump of this invention is so constructed that the pumping loss is minimized even under the high-speed operation of the pump, and that the pump will not be over loaded despite the temporary stoppage of discharge due to, for example, a collapsed rubber pipe used for discharge purposes, thereby providing adequate properties for maintaining the security of the pump and reducing the required amount of working hours of delivering liquid of predetermined quantities.

The accompanying drawings show the embodiments of the rotary pump in accordance with this invention:

FIG. I is a sectional side elevation of the rotary pump in accordance with this invention;

FIG. 2 is a sectional view taken along the line 1-1 of FIG. 1;

FIG. 3 is a side elevation showing the utilization of the pump as an oil exchanger; and

FIG. 4 is a side elevation showing another embodiment of this invention.

Referring now to the drawings, the pumps of this invention will be explained in detail below.

In FIG. I, an impeller chamber 8 is provided in a casing 2 having a liquid intake port 3 and a liquid discharge port 9 for liquid arranged so as to provide communication between said intake 3 and discharge port 9. A rotary impeller l hereinafter designated a rotor" has rubber vane 1' in pressure contact with the inner wall of the impeller chamber 8 providing for free rotation in said impeller chamber 8 in an eccentric position. An axial flow impeller 6 for applying pressure to liquid is disposed rotationally in the fluid passage connecting the impeller chamber 8 with the discharge port 9 and this axial flow impeller 6 is connected to the rotor 1 through transmission mechanisms 22 and 35.

In the pump shown in the drawing, the rotor 1 comprises a center boss portion l" and circumferentially spaced flexible vanes 1' extended radially from said boss 1''. Preferably, the vanes l' and boss 1" are integrally formed from resilient material such a rubber, synthetic resin, etc. The rotor l is mounted on a rotating shaft 10 which is eccentrically disposed in the impeller chamber 8 of the casing 2.

The fluid passage 5 from the impeller chamber 8 to the discharge port 9 is provided in parallel with the rotating shaft 50, and the axial flow impeller 6 is disposed freely rotationally in the liquid passage 5. Thus, fluid moving from the intake port 3 of the casing 2 to the impeller chamber 8 is delivered into the fluid passage 5 through a communicating passage 4 and further forced outwardly under pressure.

A collar 11 of wear resisting property is fitted into the impeller chamber 8 for supporting partition panels 13, 14 each having an opening 12 and for serving as a circumferential enclosure in the impeller chamber 8 (see FIGS. 1 and 2). It is to be under stood that the partition panels 13 and 14 are properly treated for giving a wearproofing property.

it will be further understood that the flow rate and the degree of vacuum in the impeller chamber 8 are both controlled according to the position and the size of the openings 12 in the partition walls. Alternatively, instead of utilizing the collar 11 of wear-resisting property, a wearproofing treatment .medium such as chromium plating may be directly applied to the inner peripheral wall of the impeller chamber 8 of the casing 2. In such event the partition panel 14 may be substituted for a supporting member 7 which supports the rotary shaft 10, the driving shaft 36 of the axial flow impeller 6 and the casing 2. It is also possible to form the collar 11 integrally with the supporting body 7.

Further, the rotary shaft 10 is provided with a reduction gear wheel 22 which is meshed with a gear wheel 35 mounted on the driving shaft 36, so that the rotary impeller 1 may be driven from the driving shaft 36 at a speed lower than that of the axial flow impeller 6.

in H6. 3 another embodiment of this invention is shown, in which the resilient rotor 1, that is the impeller, is provided in the vertical pump casing 2 so as to facilitate oil changing of an internal combustion engine of, for example an automobile. The driving shaft 36 is connected to the motor 23 directly mounted on the casing 2 through the supporting member fitting on said casing 2 so as to rotate both impellers 1 and 6. A suction hose or pipe 24 is detachably connected to the intake port 3 of the casing 2. A discharge hose or pipe 25 is also detachably connected to the discharge port 9 whereby the pnmp of this invention is prepared for use as an oil changer.

For example, assuming that the suction pipe 24 is connected to the oil gauge of the engine in a fluid communication arrangement, the actuation of the engine causes speedy and complete extraction of the dusty oil from the engine while entering a supply of fresh oil into the engine, whereby the oil change operation may be made in a short period of time. The pump can also be employed to speedily discharge liquid such as kerosene in small quantities into a small container from a drum, and this is constructed so as to be carried easily by hand.

in FIG. 4 another embodiment in accordance with this invention is shown, in which the intake port 3 and port 9 are provided so as to act on fluid by suction and discharge, in the substantially same direction. 5 In the drawing, number indicates a concave fluid collecting section, which communicates with the intake port 3 and a communicating opening 12 in the partition panel 13. There may be provided a slit (not shown in the drawing) in the tangential direction of the sectional circle of the intake port 3 in order to improve the suction efficiency of the pump. Numerals l6 and 17 indicate the abutting sections which are respectively provided on the casing 2 and supporting member 7. Although these abutting sections are shown in the form of flanges secured together by bolts, they may be constructed in a threadedly securing type or press-fitting type.

Numerals i8, 19, 2'1) and 21 indicate an oil sea, bearing, flange and heat-radiating fins provided on the outside peripheral surface of the casing 2. Numerals 26, 27, 28 and 29 indicate respectively a motor control switch, power connecting plug, earth clip and pipe connector provided detachably with respect to the intake port 3 and discharge port 9.

Numerals 30, 31, 32,33, and 34 respectively indicate a locking key, shaft hole, internally threaded section, check ring and gear box. In case of the utilization of the partition panels 13 and 14, it is convenient to provide said panels 13 and 14 or their associated surface sections thereof with a positioning portion, for example, pins and pin holes, or shouldered portions or notched portions. 3-5 When the rotor 1 having resilient vanes is rotated together with the shaft 10 in the impeller chamber 8, the vanes are forced against the inner wall of the impeller chamber 8 and are thereby curved in sliding engagement therewith together whereby the fluid is effectively pumped from the intake port 3 to the discharge port 9. The pumping action is further improved efficiently by rotating and driving the axial flow impeller 6 in the liquid passage 5 at a higher speed than the rotating speed of the rotor i and thus applying pressure to the fluid thereby increasing the discharge pressure of the rotor 1 between the impeller chamber 8 and the discharge port 9 with the result or a more speedy fluid-pumping operation.

Further, as above stated, fluid containing considerable amounts of dust can be delivered without difficulty by providing the rotary impeller having resilient vanes in the impeller chamber in an eccentric manner and disposing the axial flow impeller for applying pressure to liquid in the fluid passage between the impeller chamber and the discharge port. The rotary pump of this invention, thus, enables an increase in the amount of discharge by -30 percent and the degree of vacuum by 40-50 percent, and the discharge pressure several times as compared with those ofa pump having a single rotor. Particularly, the restoration actions of vanes to their normal positions are accompanied by the rotation of the axial flow impeller, and as a result thereof the pumping action is effectively improved. in addition, the lowering of efficiency due to wear of rotor is sufficiently compensated as above stated, and the pump can be used effectively without being overloaded.

What I claim is:

l. in a rotary pump wherein an impeller chamber communicating with an intake port and a discharge port is provided in a casing having said intake and discharge port; a transmission mechanism, a rotary impeller having rubber-made resilient vanes eccentrically rotatably arranged in said impeller chamber so that the outer edges of said vanes are in frictional engagement with the inner wall of said chamber; and an axial flow impeller for applying pressure to the fluid disposed rotationally in a fluid passage between said impeller chamber and said discharge port, said axial impeller being driven through said transmission mechanisms at a higher speed than that of said rotary impeller.

2. In a rotary pump wherein a pump casing having an intake port and a discharge port arranged in parallel relation to each other is provided with an impeller chamber communicating with said intake and discharge ports; a transmission mechanism, 'an impeller having radially extended resilient vanes is arrange eccentrically rotatably in said impeller chamber so that the outer edges of said impeller are in frictionally sliding-engagement with the inner wall of said impeller chamber; a fluid passage provided in parallel with said impeller chamber, said fluid passage being connected to said impeller chamber in a fluid communication manner through a communicating passage so that the fluid delivered from said with said rotary impeller; and said transmission mechanisms simultaneously driving said both impellers from a common drive power source. 

1. In a rotary pump wherein an impeller chamber communicating with an intake port and a discharge port is provided in a casing having said intake and discharge port; a transmission mechanism, a rotary impeller having rubber-made resilient vanes eccentrically rotatably arranged in said impeller chamber so that the outer edges of said vanes are in frictional engagement with the inner wall of said chamber; and an axial flow impeller for applying pressure to the fluid disposed rotationally in a fluid passage between said impeller chamber and said discharge port, said axial impeller being driven through said transmission mechanisms at a higher speed than that of said rotary impeller.
 2. In a rotary pump wherein a pump casing having an intake port and a discharge port arranged in parallel relation to each other is provided with an impeller chamber communicating with said intake and discharge ports; a transmission mechanism, an impeller having radially extended resilient vanes is arrange eccentrically rotatably in said impeller chamber so that the outer edges of said impeller are in frictionally sliding engagement with the inner wall of said impeller chamber; a fluid passage provided in parallel with said impeller chamber, said fluid passage being connected to said impeller chamber in a fluid communication manner through a communicating passage so that the fluid delivered from said impeller chamber undergoes a directional change in reverse direction and flows towards the discharge port through said fluid passage; an axial flow impeller for applying pressure to the fluid is disposed rotatably in said fluid passage in parallel with said rotary impeller; and said transmission mechanisms simultaneously driving said both impellers from a common drive power source. 